Method and apparatus for hardening axially spaced cams on a camshaft
US4728761A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1986 |
| Grant date | Mar 1, 1988 |
| Priority date | — |
| Expiry date | May 5, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D9/30
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Method and apparatus for inductively heating and quench hardening axially spaced cams on a steel camshaft having a longitudinally extending rotational axis concentric with a plurality of axially spaced bearings, which method and apparatus utilizes an induction heating coil having an inner surface surrounding the rotational axis of the camshaft with an insulating gap and integral quench openings for directing quenching liquid inwardly from the heating coil for the workpiece, and a high frequency power supply for selectively energizing the heating coil with a power density within the heating coil of about 20KW/in.sup.2 and an auxiliary cooling assembly fixed with respect to the heating coil and including an arrangement for spraying a cooling liquid toward the camshaft. In accordance with the method and apparatus, a camshaft is indexed axially through the opening of the coil and cooling assembly to a first position with a cam within the coil, at which position the camshaft is indexed to have the lobe of the cam facing the gap in the induction heating coil and a hardening cycle is then employed including induction heating of the surface of the camshaft while the cam is stationary and t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.